Coating processes – With post-treatment of coating or coating material – Heating or drying
Patent
1997-04-21
1999-11-30
Dawson, Robert
Coating processes
With post-treatment of coating or coating material
Heating or drying
427386, 427410, 525 27, 525 63, 525176, 525386, B05D 302
Patent
active
059939095
DESCRIPTION:
BRIEF SUMMARY
FIELD OF TECHNOLOGY
The present invention relates to a novel thermosetting composition comprising an epoxy group-containing modified polyester polymer and a blocked carboxyl group-containing compound, or comprising a thermal latent acid catalyst in combination with them, a method of coating which uses it as a top coating composition capable of giving excellent film properties and appearance and a coated article. The thermosetting composition is easy to prepare one component liquid of high solid content and gives excellent appearance in coating. Further, the thermosetting composition features excellent hardness, chemical resistance and stain resistance originated from a polymer of a vinyl monomer, and processability and impact resistance originated from a polyester resin, and further excellent elasticity. The present invention can be preferably used in the field of coatings, ink, adhesives and molded articles.
BACKGROUND TECHNOLOGY
It is generally known that thermosetting compositions are prepared from compounds having carboxyl groups and compounds having reactive functional groups which can form chemical bonds with the carboxyl groups by heating, such as epoxy group, oxazoline group, silanol group, alkoxy silane group, amino group, imino group, isocyanate group, blocked isocyanate group, cyclocarobonate group, vinyl ether group, vinyl thioether group, aminomethylol group, alkylated aminomethylol group, acetal group and ketal group.
As the thermosetting compositions described above, for example, compositions comprising combination of carboxyl groups and epoxy groups have been disclosed in Laid Open Japanese Patent Application Showa 51-114429, Laid Open European Patent Application 29595 and U.S. Pat. Nos. 4,371,667, 4,650,718, 4,681,811, 4,703,101 and 4,764,430.
The compositions comprising combination of carboxyl groups and oxazoline groups have been disclosed in U.S. Pat. No. 3,505,297 and Laid Open Japanese Patent Applications Showa 60-88038 and Heisei 2-115238.
The thermosetting compositions give cured products having excellent chemical properties, physical properties and weathering resistance and are widely utilized in the field of coatings, ink, adhesives and molded articles.
However, the reactivity between the carboxyl group and the reactive functional groups is high so that compositions in which compounds having carboxyl groups and compounds having the reactive functional groups exist together have problems that the compositions are gelled during storage and the period suitable for pot life is short.
The compounds comprising carboxyl groups conventionally utilized for thermosetting compositions described above have problems that solubility to generally used organic solvents is low and that compatibility to the compounds having reactive groups, which react with the carboxyl group, is inferior because of the property of the carboxyl group capable of forming strong hydrogen bonds. When the thermosetting compositions are utilized as top coating compositions, there are naturally have problems that preparation of coating composition of high solid content is difficult and that appearance of the finished coat is inferior.
For the purpose of solving these problems, it was proposed that carboxyl group was blocked by converting it to tertiary-butyl ester and the ester was decomposed by heating, and the free carboxyl group was regenerated by elimination of isobutene (Laid Open Japanese Patent Application Heisei 1-104646).
However, there were problems that this method required a high temperature, such as 170-200.degree. C., for the heat decomposition of the tertiary-butyl ester and that pock marks which were made by foaming and degassing of isobutene formed by the decomposition remained on the cured surface of the coating. Thus, this method is not sufficiently satisfactory.
The inventors have already suggested a thermosetting composition comprising a compound having functional groups in which carboxyl groups are blocked with vinyl ethers, and a compound having reactive functional groups which react the functio
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Ishidoya Masahiro
Mizutani Hiroki
Nakane Yoshinori
Aylward D.
Dawson Robert
NOF Corporation
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